package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    /**
     * 微信登录
     *
     * @param userLoginDTO
     * @return
     */
    private static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    @Override
    public User login(UserLoginDTO userLoginDTO) {
        //通过传来的code，调用微信接口，获取openid
        String openid = getUserOpenId(userLoginDTO.getCode());
        if(openid == null){//如果没有获取到openid，就返回登录失败
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //去数据库层获取用户信息，如果用户存在，就返回用户信息，如果用户不存在，就创建用户，返回用户信息
       User user =  userMapper.findByOpenid(openid);
       if(user == null){
           user = User.builder()
                   .openid(openid)
                   .createTime(LocalDateTime.now())
                   .build();
           userMapper.insert(user);
       }
       return user;
    }


    /**
     * 调用微信小程序接口，获取微信用户openid
     * @param code
     * @return
     */
    public String getUserOpenId(String code){
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");// 授权类型    固定写法
        String s = HttpClientUtil.doGet(WX_LOGIN_URL, map);
        JSONObject jsonObject = JSONObject.parseObject(s);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
